Description

DDFR Distributed Digital Fault Recorder

The DDFR is a Digital Fault and Disturbance recording system that uses communications to retrieve Fault, Disturbance, and Sequence of Event records that are captured by the protection relays distributed throughout a substation. The DDFR internally stores this critical substation information for local station troubleshooting as well as archives this data in a remote enterprise network location for permanent storage and analysis.

Applications
• Substation Distributed Digital Fault Recording
• Component in a larger enterprise wide fault and disturbance recording system

Key benefits
• Provides a permanent detailed record of all substation activity at a fraction of the cost of installing traditional Digital Fault Recorders (DFR)
• Eliminates up to one-third of substation wiring needed for protection, metering and disturbance recording
• Allows for recording of Transfer Trip Signals, Block Signals and other inter-substation messages that are sent via IEC61850 peer-to-peer messages and not recordable by traditional DFR’s
• Permits recording of internal protection relay operands and calculations in Sequence of Events (SOE) and Fault records
• Meets requirements of international Fault Recording standards when used with GE Multilin’s Universal Relay family including NERC, IEEE, ECAR, & NPCC
• Provides secure data collection while also isolating the IED network and the IT or Control network from each other with use of two seperate Ethernet ports.
• Allows users to define the poll rate for Events and Waveforms

Key Features
• Retrieves and Archives Transient Fault Records, Sequence of Event Records, and Disturbance Records recorded in protection relays distributed across the substation
• Automatically merges Events recorded in protection relays distributed across the network into a single substation wide Sequence of Event Record

• Stores months of fault and disturbance records internally, facilitating local substation analysis
• Discrete second Ethernet port will allow isolation between the network LAN and the IED’s connected to the DDFR.

Data Recording
• The DDFR will detect that new information has been recorded in a relay and automatically retrieve and archive this data. Information that will be archived from protection relays include:
• Transient Fault Records
• Sequence of Event Records
• Disturbance Records

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